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- W2009749435 abstract "Background.Recent studies suggest that interleukin-1β (IL-1β) stimulates the production of the acute phase protein complement component C3 in human intestinal epithelial cells. The transcription factor NF-κB activates different genes involved in the response to cytokines. It is not known if IL-1β-induced C3 production in the enterocyte is regulated by NF-κB. Materials and methods.Cultured Caco-2 cells, a human intestinal epithelial cell line, were treated with one of the NF-κB inhibitors, tosyl-lys-chloromethylketone (TLCK), genistein, or pyrrolidine dithiocarbamate (PDTC), or withN-acetyl-leu-leu-norleucinal (LLnL), a proteasome inhibitor known to block the degradation of Iκβ, the cytosolic inhibitor of NF-κB. Following this treatment, the Caco-2 cells were stimulated with IL-1β, and C3 levels in the culture medium were measured after 24 h by ELISA. C3 mRNA levels were determined after 4 h by Northern blot analysis. In other experiments, Caco-2 cells were transfected with a mutant IκBα in which serines 32 and 36 were substituted by alanine. This mutation prevents IkBα phosphorylation and subsequent NF-κB nuclear translocation. After transfection, the cells were stimulated with IL-1β, and C3 levels in the culture medium were measured after 24 h. Cytosolic IκBα was determined by Western blot analysis. Results.TLCK, genistein, and LLnL each inhibited IL-1β-induced C3 production in a dose-dependent fashion. These responses were associated with decreased C3 mRNA levels. In contrast, PDTC did not influence C3 production or C3 mRNA in the Caco-2 cells. Transfection of the Caco-2 cells with the Ser 32/36 mutant IkBα resulted in maintained IκBα levels and decreased IL-β-induced C3 production. Conclusions.IL-1β-stimulated C3 production in the enterocyte may be regulated by NF-κB." @default.
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- W2009749435 date "1999-03-01" @default.
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- W2009749435 title "Complement Component C3 Production in IL-1β-Stimulated Human Intestinal Epithelial Cells Is Blocked by NF-κB Inhibitors and by Transfection with Ser 32/36 Mutant IκBα" @default.
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- W2009749435 doi "https://doi.org/10.1006/jsre.1998.5503" @default.
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